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TitleQuaternary geology and till composition north of Wager Bay, Nunavut: results from the GEM Wager Bay Surficial Geology Project
AuthorMcMartin, I; Campbell, J E; Dredge, L A; LeCheminant, A N; McCurdy, M W; Scromeda, N
SourceGeological Survey of Canada, Open File 7748, 2015, 58 pages, (Open Access)
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
File formatreadme
File formatpdf; rtf; jpg; docx; xlsx
NTS46E/05; 46E/06; 46E/10; 46E/11; 46E/12; 46E/13; 46E/14; 46E/15; 46E/16; 46L; 46K/04; 46M/03; 46M/04; 46M/05; 56H/09; 56H/10; 56H/13; 56H/14; 56H/15; 56H/16; 56J/01; 56J/02; 56J/03; 56J/04; 56J/05; 56J/06; 56J/07; 56J/08
AreaWager Bay; Repulse Bay; Melville Peninsula; Fort Hope; Ford Lake; Bury Cove; Cape Watt; Cape Hope; Ross Inlet; Lefroy Bay; Miles Lake; Brown Lake; Darby Lake; Frost Lake; Battery Lake; Cowie Point; Pearce Lake; Nuvuk Point; Beach Point; Bennett Bay; Walker Lake; Curtis Lake; Monroe Inlet; Hall Islands; Stewart Lake; Gordon River; Hansine Lake; Haviland; Cape Simpson; Suluraq Point; Sabine Island; Cape Montague; Cameron Inlet; Committee bay; Usiariaq Lake; Aivilik Point; Cape McTavish; Panalik Point; Tikilak Point; Savage Islands; Point Hargrave; Qinnguq Island; Swanston Point; Sinclair Point; Paliak Islands; Harbour Islands; Cape Lady Pelly; Nuvudlik Island; Lorillard River; Inuksulik Point; Douglas Harbour; Lorillard River; Piksimanik River; Ugliarjuk Island; Piksimanik River; Umiijarvik Point; Piksimanik River; Ikaaqtalik Point; Ikaariarvik Reef; Tuluarvik Island; Uglialuk Islands; Miertsching Lake; Siuraqtujuq Point; Smooth Rock Point; Pitiktarvik Point; Roes Welcome; Handkerchief Point; Mamittuittuq Inlet; Ulaqitaarvik Point; Ujarasugjulik Point; Qirniqtuarjuk Point; Why-Nee-Yulik Point; Imiqqutailaqtuuq Islands; Qirniqtut Hill
Lat/Long WENS -92.0000 -85.9167 67.6667 65.5000
Subjectssurficial geology/geomorphology; geochemistry; tills; till analyses; till geochemistry; deglaciation; glacial deposits; glacial features; glacial landforms; drift deposits; glacial history; drumlins; moraines; glacial striations; Cenozoic; Quaternary
Illustrationslocation maps; tables; flow charts; photographs; plots
Natural Resources Canada Library - Ottawa (Earth Sciences)
ProgramRae Province, Tehery-Wager Bay, GEM2: Geo-mapping for Energy and Minerals
Released2015 06 18
AbstractThis report presents the field database and analytical results from the Geological Survey of Canada's 2010 to 2012 surficial geology mapping and till sampling campaign in the north Wager Bay project area, mainland Nunavut. An overview of the Quaternary geology of this area is provided together with an interpretation of till provenance, as well as a discussion on the implications for mineral exploration. Field observations and surficial geological mapping indicate the region is key for the glacial history reconstruction of the northeastern part of the Keewatin Sector of the Laurentide Ice Sheet. Most of the study area was located within an extensive onset zone of a large ice stream flowing north into Committee Bay during the last glaciation and early deglaciation, from an ice divide located over and/or south of Wager Bay. Major ice-flow reversals into Repulse Bay and Wager Bay, as a result of drawdown into the opening marine waters in Hudson Bay, are indicated for the latest deglaciation phases. Coldbased ice remnant masses over the uplands north of Wager Bay preserved relict, weathered and fresh glacial landscapes at the end of deglaciation. Although there is evidence of multiple ice-flow directions in the study area, the main ice-flow phase, which converges north (NNE to NNW) towards Committee Bay, is the predominant direction of glacial transport and shaped most prominent streamlined landforms. The carbonate clast content and Al2O3 concentrations in surface till indicates relatively long glacial transport distances linked to glacial dispersal by the ice stream.
Mg-rich olivine, many having >Fo90 and high NiO contents, are abundant in till in the center of the study area where a frost-shattered ultramafic lamprophyre boulder was found at the surface. Location of the boulder, its distinctive composition, and the olivine in till distribution in conjunction with the glacial transport history, suggest an ultramafic bedrock source other than kimberlite fields known in the region. In the western part of the study area south of Walker Lake, forsteritic olivine and chromite grains in till, locally coincident with ultramafic boulders, form a 35 km-long NNE dispersal train. This dispersal plume points to olivine-rich crustal rocks within undifferentiated Archean supracrustal rocks, and suggests these rocks have potential to host Ni-Cu-PGE mineralization. In addition to known Penhryn Group rocks and extensions of this belt to the southwest, there are suspected but poorly mapped strands of supracrustal rocks between Beach Pt and Wager Bay which show potential for base- and/or preciousmetal mineralization. More detailed till sampling, prospecting and bedrock mapping is required to better assess mineral potential in these areas.
Summary(Plain Language Summary, not published)
This publication includes the complete datasets and interpretations related to field observations and composition of surface glacial sediments collected in 2010, 2011 and 2012 north of Wager Bay, central mainland Nunavut. This work provides new geological knowledge of the history and nature of surficial materials left by the retreat of the last glaciers, and discusses mineral potential along the northwest coast of Hudson Bay. The findings will support informed decision making for resource exploration and development, and for land use management. This work was conducted under the Melville Peninsula Project at the Geological Survey of Canada, as part of Natural Resources Canada's Geo-mapping for Energy and Minerals (GEM-1) Program.